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Repeatable chaotic spread spectrum dcsk modulation and demodulation method and modem

A modem, modulation and demodulation technology, applied in the field of repeatable chaotic spread spectrum DCSK modulation and demodulation method and modem, and can solve the problem of low confidentiality and high

Active Publication Date: 2022-04-22
HUNAN INST OF TECH
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Problems solved by technology

[0004] One of the purposes of the present invention is to provide a repeatable chaotic spread spectrum DCSK modulation and demodulation method, to solve the problem that the confidentiality of the existing DCSK modulation and demodulation method is not high

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  • Repeatable chaotic spread spectrum dcsk modulation and demodulation method and modem
  • Repeatable chaotic spread spectrum dcsk modulation and demodulation method and modem
  • Repeatable chaotic spread spectrum dcsk modulation and demodulation method and modem

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Embodiment Construction

[0033] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0034] figure 1 Shows the entire process of the repeatable chaotic spread spectrum DCSK (ie RCSS-DCSK) modulation and demodulation method, as shown in figure 1 As shown, at the sending end, the signal modulation process at least includes: 1. Serial-to-parallel conversion of the input serial information signal. 2. Obtain the discrete chaotic signal sequence; delay the discrete chaotic signal sequence to obtain a DCSK reference signal; use the discrete chaotic signal sequence before and after the delay to generate a repeatable chaotic spread spectrum sequence to obtain the RCSS reference signal. 3. Divide the serial-to-parallel converted information signal into two parallel signals; one parallel signal is modulated by a discrete chaotic signal sequence and a DCSK reference signal to fo...

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Abstract

Repeatable chaotic spread-spectrum DCSK modulation and demodulation method and modem, the aforementioned repeatable chaotic spread-spectrum DCSK modulation and demodulation method is to generate a repeated chaotic spread-spectrum sequence by copying the reference signal of the differential chaos shift keying modulation signal, and then combine the And the converted part of the data stream is multiplied to form RCSS‑DCSK signal, and the remaining parallel data stream is DCSK modulated to form DCSK signal, and then the RCSS‑DCSK signal and DCSK signal are added and sent to the channel for transmission, and finally received The terminal performs relevant demodulation to recover the original information. The bit error rate of the system using this modulation and demodulation method is lower than that of DCSK, CDSK and CD‑DCSK systems under the same spreading factor, and the smaller the spreading factor is, the lower the bit error rate is, and the system has higher confidentiality and is easier for eavesdropping. The latter is more difficult to detect and restore the original data, which can better meet the confidentiality requirements of the chaotic communication system in practical applications.

Description

technical field [0001] The invention relates to the technical field of communication signal processing, in particular to a repeatable chaotic spread spectrum DCSK modulation and demodulation method and a modem. Background technique [0002] Chaotic digital modulation technology can not only retain the characteristics of low intercept probability and reduce multipath effect of traditional spread spectrum communication system, but also show unique advantages in many other aspects, such as reducing system hardware cost, improving communication security, Improve the performance of spread spectrum communication systems, etc. In recent years, chaotic digital modulation technology has become one of the hot issues concerned and researched in the field of nonlinear science and information science. [0003] Because there is no reliable and effective method to achieve chaos synchronization at the receiving end, most of the existing chaotic digital modulation and demodulation methods a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L27/00H04B1/707
CPCH04L9/001H04L27/001H04B1/707H04L2209/12
Inventor 贾雅琼俞斌王晓丽吴薇尹艳清杨湘杰
Owner HUNAN INST OF TECH
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